From human herpes virus-6 reactivation to autoimmune reactivity against tight junctions and neuronal antigens, to inflammation, depression, and chronic fatigue syndrome due to Long COVID. — ME/CFS Atlas
From human herpes virus-6 reactivation to autoimmune reactivity against tight junctions and neuronal antigens, to inflammation, depression, and chronic fatigue syndrome due to Long COVID.
Maes, Michael, Almulla, Abbas F, Tang, Xiaoou et al. · Journal of medical virology · 2024 · DOI
Quick Summary
This study observed associations between certain immune responses (antibodies against bacterial toxins and tight junction proteins) and Long COVID symptoms including fatigue and mood changes. Researchers measured antibodies and inflammation markers in 90 Long COVID patients and 90 healthy controls. The findings are preliminary and require replication in larger studies before they can guide patient care.
Why It Matters
By analogy, if similar immune dysregulation involving tight junction antibodies and HHV-6 occurs in ME/CFS, it could illuminate one candidate pathway linking viral reactivation to symptom severity. The study links multiple immune and viral markers in a single analytical framework, which may help researchers identify testable biomarker patterns relevant to ME/CFS. However, relevance to ME/CFS remains unclear until findings are replicated in ME/CFS-specific cohorts.
Observed Findings
Antibodies to lipopolysaccharides (IgA-LPS and IgG-LPS) and tight junction proteins (IgG-ZOOC and IgA-ZOOC) were associated with Long COVID diagnosis, with a neural network model achieving 75.5% discrimination accuracy.
C-reactive protein, antibodies to myelin basic protein (IgA-MBP and IgG-MBP) were associated with 40.9% of variance in physical and affective symptoms combined.
Autoimmunity to tight junction proteins (ZOOC) was associated with 36.3%–39.7% of variance in autoimmune responses to myelin basic protein.
Indicators of HHV-6 reactivation were associated with autoimmunity to tight junction proteins, which in turn was associated with elevated antibodies to SARS-CoV-2.
Inferred Conclusions
The authors propose that autoimmunity against tight junction components and bacterial lipopolysaccharide translocation may be involved in Long COVID's physio-affective phenotype.
They interpret the association between HHV-6 reactivation and both tight junction autoimmunity and SARS-CoV-2 antibodies as suggestive of a viral reactivation pathway linking to immune dysregulation.
The finding that tight junction autoimmunity predicts myelin-directed autoimmunity is interpreted as one possible mechanism connecting intestinal barrier changes to neuronal autoimmunity.
Remaining Questions
Does tight junction autoimmunity precede or follow symptom onset in Long COVID, and is the association causal or epiphenomenal?
What This Study Does Not Prove
This cross-sectional design does not establish causation, temporal sequence, or whether the observed antibodies contribute to or result from Long COVID symptoms. The study does not demonstrate that tight junction autoimmunity or HHV-6 reactivation cause the physio-affective phenome. Findings do not generalise beyond the 90 Long COVID patients studied, and do not constitute a treatment recommendation or diagnostic test.
About the PEM badge: “PEM required” means post-exertional malaise was an explicit required diagnostic criterion for participant inclusion in this study — not that PEM was studied, observed, or discussed. Studies using criteria that do not require PEM (e.g. Fukuda, Oxford) are tagged “PEM not required”. How the atlas works →
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